How do I report a bug in the online software

Yesterday when filing my taxes online with turbo tax using the free tax filing platform I was informed that my employer had withheld to much money for my Social Security Tax. I was instructed to contact my employer and let them know that I needed a W2 correction. My Employer then wanted to know how it was calculated that there was an overpayment of my Social Security Tax withholding. So after trying to see if there was a way to find out howvTurbo Tax had calculated what I should have had withheld for my SS tax I came across information of how TT calculated the tax information to determine and tell me that my employer had deducted to much $ for that withholding. I also looked up what the IRS calculation method was for verifying what should be withheld and both the IRS and Turbo Tax use the same calculation method which was what I was hoping to find. So then I did the calculations myself using the same method and the calculation method came up with the same amount of tax that should have been withheld that my employer has on my W2. So then I went back to TT and double checked my gross income on my tax return to make sure I didn't make an error when putting in that information and I put in exactly what is on my W2 therefore this mistake is not a data entry error and no fault on my part. So that means that there is a bug in the online software which has resulted in my return being incorrectly flagged for a W2 correction before the IRS will issue my refund once they start doing so. Does anyone know how I can report this and get the incorrect flag removed so that there is not a delay in receiving my tax refund.